MESOSCALE DISCUSSION 0034
   NWS STORM PREDICTION CENTER NORMAN OK
   0637 AM CST WED JAN 19 2011
   
   AREAS AFFECTED...PARTS OF CENTRAL NEB
   
   CONCERNING...HEAVY SNOW 
   
   VALID 191237Z - 191730Z
   
   SNOW WILL DEVELOP FROM W-E ACROSS CENTRAL NEB THIS MORNING...WITH
   THE POTENTIAL FOR RATES TO INCREASE TO 1+ IN/HR BY MID-LATE MORNING
   /15-18Z/.  THE AREA OF CONCERN IS 30 MILES EITHER SIDE OF A LINE
   FROM KMHN TO 25 N KGRI.
   
   EARLY MORNING WATER VAPOR IMAGERY SHOWED A PRIMARY SHORTWAVE TROUGH
   TRACKING SEWD TOWARD THE GREAT BASIN...WHILE A WEAKER LEAD IMPULSE
   WAS SHIFTING EWD THROUGH WY.  THE ENTRANCE REGION OF A 50-60 KT WLY
   MIDLEVEL JET ATTENDANT TO THIS LEAD WAVE WILL MOVE ACROSS NEB DURING
   THE MID-LATE MORNING.  MEANWHILE...WIND PROFILERS/WSR-88D VADS
   SHOWED A STRENGTHENING SLY LLJ FROM THE TX PANHANDLE/WRN OK TO WRN
   KS IN RESPONSE TO HEIGHT FALLS AHEAD OF THE GREAT BASIN TROUGH AND
   LEAD IMPULSE.  INCREASING LOW LEVEL WAA ALONG THE LLJ INTO SRN NEB
   JUXTAPOSED BENEATH FORCING FOR ASCENT WITHIN THE ENTRANCE OF THE
   LEAD IMPULSE JET STREAK SHOULD SUPPORT AN INCREASE IN UPWARD
   VERTICAL MOTION BETWEEN 15-18Z.  FORECAST SOUNDINGS SUGGESTED THE
   DENDRITIC SNOW GROWTH LAYER WILL RESIDE WITHIN PART OF THE STRONGER
   UVVS...ENHANCING THE SNOWFALL RATES.
   
   RECENT TRENDS IN REGIONAL RADAR IMAGERY SHOWED SEVERAL WNW-ESE
   ORIENTED BANDS OF SNOW DEVELOPING OVER SWRN SD INTO THE WRN HALF OF
   NEB.  THE EXPECTED WNW-ESE ORIENTATION TO THE GREATER SNOWFALL RATES
   PER DETERMINISTIC MODEL CONSENSUS/03Z SREF APPEARS TO BE ASSOCIATED
   WITH MIDLEVEL FRONTOGENESIS ALSO ORIENTED WNW-ESE.  GIVEN SURFACE
   TEMPERATURES IN THE MID TEENS TODAY RESULTING IN HIGHER SNOW
   RATIOS...THE DENDRITIC ENHANCEMENT WILL FURTHER ENHANCE THE SNOWFALL
   RATES WITHIN THE DISCUSSION AREA...ESPECIALLY BY 15-18Z.
   
   ..PETERS.. 01/19/2011
   
   
   ATTN...WFO...GID...LBF...
   
   LAT...LON   42029900 41839840 41229829 40949866 41169967 41390066
               41940111 42400066 42029900